* {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

body {
  padding: 10px;

  font-family: Arial;

  background-color: #fdfdfd;
}

.h3 {
  font-family: 楷体;

  color: aliceblue;
}

/* 头部标题 */
.header {
  border-radius: 15px 15px;
  padding: 5px;

  font-family: Segoe, 'Segoe UI', 'DejaVu Sans', 'Trebuchet MS', Verdana,
  'sans-serif';
  text-align: center;

  background: white;
  background-color: #777;
}

.navi {
  width: 6%;
}

.column {
  float: left;

  position: absolute;
  top: 40px;
  left: 15px;

  padding: 20px;
  height: 10%;
}

.navi a {
  display: block;

  margin-bottom: 4px;
  border-radius: 15px 15px;
  padding-top: 20px;
  padding-right: 20px;
  padding-bottom: 20px;
  padding-left: 10px;
  width: 60px;
  height: 10%;
  height: 60px;

  font-size: 15px;
  text-align: center;
  text-decoration: none;

  color: rgb(3, 3, 3);
  background-color: rgb(226, 226, 226);
}

.navi a:hover {
  background-color: #82e8ff;
}

.header h1 {
  font-size: 50px;
}

/* 导航条 */
.topnav {
  overflow: hidden;

  border-radius: 15px 15px;

  background-color: #333;
}

.leftcolumn {
  float: left;

  width: 75%;
}

.rightcolumn {
  float: left;

  padding-left: 20px;
  width: 25%;

  background-color: #f1f1f1;
}

.text {
  display: -webkit-box;
  display:    -moz-box;
  overflow: hidden;
  overflow: auto;

  border-radius: 15px 15px;
  padding: 5px;
  width: 100%;
  height: 250px;

  font: 20px 黑体;
  line-height: 30px;
  text-indent: 2em;

  background-color: #aaa;

  -webkit-line-clamp: 2;
}

b {
  line-height: 30px;
}

/* 文章卡片效果 */
.card {
  margin: auto;
  margin-top: 20px;
  border-radius: 15px 15px;
  padding: 20px;

  background-color: #ccc;
}

/* 列后面清除浮动 */
.row:after {
  display: table;
  clear: both;

  content: '';
}

/* 底部 */
.footer {
  margin-top: 20px;
  border-radius: 15px 15px;
  padding: 20px;

  text-align: center;

  background-color: #777;
}
